Vibration detecting transducer integrated with a network transfer function

ABSTRACT

The present invention discloses an earthquake detection control system, comprising: a detection device, having a plurality of vibration sensors and a microprocessor, the detection device uses the ON/OFF states of the vibration sensors to detect the occurrence of earthquake and uses the microprocessor to calculate the number of the ON/OFF states so as to obtain vibration data; a central monitor computer  2  for receiving, analyzing and judging the vibration data and outputting an output signal representing earthquake intensity; and a control device  3  for generating a control signal according to the output signal so as to perform a predetermined control action.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an earthquake detection control system, and inparticular to an intelligent earthquake detection control system, usingan intelligent control method to complete the manufacture of anearthquake detector. First, a feedback control technique is used tosense the magnitude of vibration strength by a sensor, and then thesensed magnitude is transmitted to a central monitor center. After thecentral monitor center judge magnitude and hypocenter, a precautionaction is taken and sent to local computers through a local areanetwork. After that, before the seismic waves arrive, the localcomputers shut off immediately some important instruments (such as gasswitches and main power switches) of dangerous installations which maycause a second disaster. When the earthquake occurs, an appropriateaction is taken so as to attain the purpose of distributed control.

2. Description of the Related Art

Even in the high-technique age, earthquake is one of the naturaldisasters that can't be predicted or forbidden. The area of PacificOcean comprising western US, Japan and Taiwan belongs to the area whereearthquake frequently occurs and some of them are very strong. Accordingto the detecting data of the past ninety years collected by the CentralWeather Center, there is an average number of 2200 times of earthquakeoccurred in Taiwan each year, wherein most of them can't be felt byhuman, 214 times can be felt and almost one dangerous earthquake bringsdisaster.

Even the earthquake may not bring direct harm to the human and animals,the building may be destroyed as to hurt other people and animals afterserious shaking, and thus the status of damage would be very serious.

While serious earthquake or after serious earthquake, at least one ofthe following damages may occur: The breakdown of the buildings,especially the public buildings, like theaters, schools, hospitals,markets and crowded area where many people get hurt or die; The collapseof the dam, the breakdown of the reservoir; and the route change of theriver; The breakdown of the house, it turns that the gas, oil and ovenmay cause fire accident; The breakdown of the highway and bridge, theroad may turns up or turns down, it may cause traffic jam that may delaythe fire engine and the ambulance; it expands the crisis of theearthquake; and As to nuclear plant, it makes the radioactive materialspread out. Additionally, it also damages the electric power plant andcauses fire. In another aspect, it also damages the natural gas plantsand makes the gas spread out. To sum up, these dangerous installationscause ‘the second disaster’.

Some published papers concern earthquake detection and the warning afterearthquake occurs, i.e., the paper of Paolo Gamba and Casciati et al.,“GIS and image understanding for near-real time earthquake damageassessment” (Photogram metric Engineering & Remote Sensing, Vol. 64, No.10, pp. 987-994, 1998); the paper of M. Matsuoka and F. Yamazaki et al.,“Use of interfero metric satellite SAR for earthquake damage detection”(Proc. 6^(th) International Conference on Seismic Zonation, EERI,CD-ROM, 2000); and that of Yu Moroz, “On the Technique for trackingbried precursors of strong earthquake in the low-frequency telluricfield of Kamachatka,” (Phys, Sold Earth (Eng. Transl.), Vol. 30, pp.830-832,1995), however, few of these papers concern vibration detectiondevice and real time earthquake detection control system; however, thefocus of these papers' attention still is the detection of earthquakeand some warning instruction thereof.

Jiro Chiba has proposed one method to measure earthquake magnitudes. Ashis paper, “Sensor for Gravitational Field and It's Application ToMeasure Against Large Earthquake Disasters” (Proceedings: Institute ofElectrical and electronics Engineers 28th Annual International CarnahanConference on, 12-14, 1994), where is a theory that applies theGravitational Field to use the Michelson interferometer to measureearthquake magnitudes, however, it doesn't teach how people should adaptthe immediate responding methods after earthquake occurrence. Besides,in the paper of Kou Takubo, Takashi Yanada, et al., “Innovative SpectralIntensity Transducer Using Three-Axial Micro Machine Accelerometer ForEarthquake Crisis Management” (Emerging Technologies and FactoryAutomation, Proceedings. ETFA '99. 1999 7th IEEE InternationalConference on, vol. 1, pp. 379-384, 1997), a new generation SpectrumIntensity (SI) transducer has been developed by utilizing micromachiningthree-axial accelerometer and a newly developed SI calculation algorithmfor the earthquake damage detection. This is a precisely seism scopelimited to detection function, but it doesn't disclose the real timealgorithm for processing methods. While the strong earthquake occurs,the seismic center spreads out the earthquake waveform, it moves towardthe four directions at the speed of 7 km/sec. If the master safetyswitch of the high dangerous installations, such as nuclear power plantand natural gas plant can be cut off immediately before the seismicwaves arrive and the disaster resulted from earthquake would be reduced.

SUMMARY OF THE INVENTION

The object of this invention is to design a vibration detectingtransducer with network transfer and shut-off dangerous installationswitch function (NT&SD Transducer) . It is not to predict the time ofearthquake or to analyze the reasons of earthquake occurrence. Accordingto this invention, a detection device as “NT&SD Transducer” is provided.While the earthquake occurs, the main control center will focus on thedangerous installations, such as natural gas plant and power plant,which may cause the secondary disaster, if they are shut downimmediately before the seismic waves arrive, people will be protectedfrom those equipments and the secondary disaster can be reduced.

A BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of the “NT&SD Transducer”;

FIG. 2 is an internal hardware structure of the “NT&SD Transducer”;

FIG. 3 shows earthquake waveform and magnitudes from the CentralMonitoring Center Display;

FIG. 4 shows an electric relay device used to shut off the master safetyswitch of power;

FIG. 5 is the flowchart of the Real Time Local Area Data ProcessingProgram;

FIG. 6 is the flowchart of the Real Time Local Area Control InstructionExecuting Program;

FIG. 7 is the flowchart of the Real Time Central Area Monitoring CenterData Processing & Control Instruction Program;

FIG. 8 is the “NT&SD Transducer” used in the Danger EliminatedMonitoring System in a Distributed Area.

DETAILED DESCRIPTION OF THE INVENTION

The technology of so-called “NT&SD Transducer” according to thisinvention is described based on the design concept of vibrationdetection device which is: while the magnitude of the strong earthquakereaches 7 (M=7), the earthquake wave moves to the four directions at thespeed of 7 km/sec. Exactly, the speed of the network transfer is about400 times over the seismic waves, if the network transfer method isapplied to shut off the master safety switch of dangerous installationsbefore the seismic waves arrive while the strong earthquake occurs, thedegree of disaster will be decreased. That is, the purpose of the “NT&SDTransducer” is to adapt required methods before the seismic wavesdestroy the dangerous installations.

The “NT&SD Transducer” essentially comprises following functionsincluding Detection of shaking degree, Network Transfer (NT) andShut-Off Dangerous Installation (SD).Besides, details related to “NT&SDTransducer” includes (1) the design rule analysis (2) the productionmethod ; (3) the calibration of the “NT&SD Transducer” and ; (4) thecorresponding real time algorithm of the “NT&SD Transducer” in Local andCentral Area Monitoring Center will be described as follows:

1. The Design Rule Analysis

-   -   The “NT&SD Transducer” uses the vibration sensor to detect the        occurrence of the shaking. The characteristic of the vibration        sensor is: while the shaking sensor stands stationary, the        resistance of the vibration sensor is infinite, then it is at        the OFF status; while the “NT&SD Transducer” is suffered by the        external power, it reaches at the status of centrifugal force,        the plane surface slants, the characteristic of the resistance        of the vibration sensor has been changed to 0, then it is at the        “ON” status. While the external power disappears, the vibration        sensor turns back to the ‘OFF’ status. And the data of the        shaking will be analyzed through the micro chip 89C51 in        reference to Ayala (1997), “The 8051 Microcontroller:        Architecture, Programming and Applications” and Kleitz (2000),        “Digital & Microprocessor Fundamentals Theory & Application”;        then judge the level of the shaking; through the detecting of        89C51 and the calculation of the occurrence times of ‘ON’,        ‘OFF’. Therefore the magnitude of the earthquake can be decided.        Through the network, the “shaking data” can be transferred,        detected by the “NT&SD Transducer” to the PC computers of the        Local Area Monitoring Center. the detected “shaking data” can        also be transferred by the parallel bus, then the data reaches        the 8255 interface card 21 in reference to Brain (1995), “Visual        C++2 Developing Professional Applications in Window 95 & NT        Using MFC”, then transfer to the PC Computer of the Local Area        Monitoring Center finally. The Local Area Monitoring Center        collected all the shaking data of the “NT&SD Transducer”, then        through the TCP/IP communication protocol in reference to Feit        (1993), “TCP/IP Architecture Protocols & Implementation”, the        data transfers to the Central Area Monitoring Center.

The Central Area Monitoring Center will judge whether it is theearthquake or not. At the meantime, the Central Area Monitoring Centerwill judge if the earthquake magnitude exceeds the dangerous status. Ifthe reliability of the earthquake is ensured, the Control Instructionwill be sent out immediately. The UPS will be turned on. Furthermore, byusing of the TCP/IP protocol, the Control Instruction will betransferred to the Local Area Monitoring Center. The Local AreaMonitoring Center will execute the mission to shut off the master safetyswitch of the dangerous installation finally.

2. The Production Method

The block diagram of the “NT&SD Transducer” and the internal hardwarestructure are shown in FIG. 1 and FIG. 2 respectively. There are threekey functions of the “NT&SD Transducer”: one is the real time DetectingUnit; the other is the real time Data Transfer Unit; and another is thereal time Control Unit.

2.1 The Real Time Detecting Unit:

First, a filter is designed which can filter out the noise of theexternal shaking signals while the earthquake waveform signals enter the“NT&SD Transducer”. Then the shaking degree of the rest of the signalswill be going through the micro-chip 89C51 analysis.

2.2 The Real Time Data Transfer Unit

The “NT&SD Transducer” has two ways to transfer the detected shakingdata to the Local Area Monitoring Center computer, one is using theEthernet Wire Network Transfer, and the other is using the Parallel Busand the 8255 interface card 21 of the Local Area Monitoring Centercomputer.

2.3 The Real Time Control Unit:

The Central Monitoring Center can detect the transferred shaking signalanalysis, and judge the shaking magnitude and the shaking source, asFIG. 3. If there are 70% of the “NT&SD Transducer” in the Local Area hasdetected the magnitude exceeds the safety range, a Control Instructionwill be sent to the Local Area Monitoring Center. The Local AreaMonitoring Computer will execute the “SD” action through the “NT&SDTransducer” and shut down the master safety switch of the dangerousequipment that could reflect the secondary disaster easily, such as thepower plant and the natural gas plant. In FIG. 4, an Electric RelayDevice is designed to shut off the master safety switch of power.

3. The “NT&SD Transducer” Calibration

In order to forbid bringing people the damages of economics and theinconvenience of life by executing incorrect “SD” action of theincorrect earthquake magnitudes detected by the “NT&SD Transducer”, themost important part is to establish the calibration table prior toactually applying the “NT&SD Transducer”. The distinction of themagnitudes of the earthquake is based on the ON-OFF times of thevibration sensor that is detected by the inner “micro-chip” of the“NT&SD Transducer”. During the same period of time, if the ON-OFF timesof the vibration sensor are higher, then the magnitudes of theearthquake is stronger, and vice versa.

The “NT&SD Transducer” calibration table which is the results of somespecific vibration experiments, i.e., in Taiwan, there is a “BuildingVibration Damage Center” where provides a vibration platform in thelaboratory thereof. Some experiments capable of simulating the 1 to 7magnitude's earthquake vibration of the real earthquake are carried outin the laboratory, and the appropriate materials and building structurecould be found out and designed as to support the building to againstthe strong earthquake. Various times of rehearsal experiments are madeto establish the calibration table of the relation between the ON-OFFtimes of the vibration sensor and the magnitudes of the simulatedearthquake.

3.1 The Experiment of the “NT&SD Transducer” that Owns One VibrationSensor.

To implement the test of the “NT&SD Transducer” that owns one vibrationsensor located on the vibration platform in the laboratory, thevibration platform will simulate to occurred earthquake magnitude M=1˜7.The micro-chip inside the “NT&SD Transducer” records the data of thetotal ON-OFF times of the vibration sensor every 5 seconds. If there are10 intervals, the total time is 50 seconds. The experiment for 1000tests is implemented repeatedly. The average value of the 1000 tests isshown in Table 1.

3.2 The Experiment of the “NT&SD Transducer” That Owns Eight VibrationSensors.

In Table 1, the “NT&SD Transducer” that owned one vibration sensor aretested. But, in order to increase the accuracy of the detection,vibration sensors are installed on the front side and the reverse sideof the four corners. There are eight vibration sensors in the “NT&SDTransducer” now. The electric circuit becomes more complicated thanbefore. The detection and calculation of the micro-chip inside the“NT&SD Transducer” becomes more difficult than before, too. But theresult becomes more precise. The “NT&SD Transducer” that contains eightvibration sensors are put on the vibration platform in the laboratory.Then, the vibration platform occurred the earthquake magnitudes M=1˜7.The micro-chip inside the “NT&SD Transducer” records the data of thetotal ON-OFF times of the eight vibration sensors every 5 seconds. Thereare 10 intervals and the total time is 50 seconds. The experiment for1000 tests is implemented repeatedly. The average value corresponding tothe total ON-OFF times and the earthquake magnitudes of the 1000 testsare shown in Table. 2. Remark 1: After establish the “NT&SD Transducer”calibration table, the result is obtained from the vibrationexperiments, the table of the total ON-OFF times that are correspondentto the magnitudes of the simulated actual earthquake is set in thecomputers of the Central Area Monitoring Center. Once the earthquakeoccurred, the data detected by the “NT&SD Transducer” can be analyzedand compared by the Central Area Monitoring Center. Then the CentralArea Monitoring Center can implement appropriate mission. Remark 2:According to this invention, it is not necessary to discuss the quantityamount of the vibration sensors owned in a single “NT&SD Transducer”that would increase the correctness of the magnitude of the earthquakedetection. But without loss of generality, the more quantity amount ofthe vibration sensors owned in the “NT&SD Transducer”, the highercorrectness of the magnitude of the earthquake detection. But the costof the “NT&SD Transducer” increases a lot, too.

3.3 Comparing With Traditional Seismometer Equipment

The traditional earthquake seismometers use the electronic moving rollerto record the time and the magnitudes of the earthquake. It is necessaryto change the recording paper battery and ink after a period of time.This traditional seismometer needs to be adjusted and maintainedregularly, it is very inconvenient for the user. Today, the electronicself-recording earthquake detecting equipment is adapted widely, but theprice and the usage procedure bothers the users more, too. Therefore,the electronic self-recording earthquake detecting equipment is used alot in the research unit and college related departments.

The “NT&SD Transducer” according to this design will keep monitoringwhile earthquake occurs. And the data would be stored in the computerautomatically. The system according to this design could add extratotally automatic recording attachments. These would be stored in thehardware or CD (MO) continuously. And the data stored in the computercould be printed out for an extra back-up.

4. The Real Time Algorithm of the Distributed Area Control System

The real time Algorithm of Local Area Data Processing Unit, Local AreaControl Instruction Executing Unit, Central Area Monitoring Center DataProcessing & Control Instruction Unit are presented as follows:

4.1 Local Area Data Processing Unit

For every local area, it receives the transferred shaking data from allthe “NT&SD Transducer” those are connected with the Local Area. Then, itfilters out the useless data (Communication Transferring Mistake andVibrate Sensor Out of work). Then, it assigns the number and records thetime and place of each shaking data. Then, it transfers back to theCentral Area Monitoring Center through the network wire. As shown inFIG. 5 is the Flowchart of the real time Local Area Data ProcessingProgram.

4.2 Local Area Control Instruction Executing Unit

While receiving the “Control Instruction” from the Central AreaMonitoring Center, Local Area Control Center decodes the data. TheRe-check Action is made (comparing the total shaking data of all the“NT&SD Transducer” in the Local Area Monitor Center computer, then.After that, it judges if the average earthquake magnitude is greaterthan 4 (Mav>4) of 70% “NT&SD Transducers” in the Local Area. If it does,it shuts off the master safety switch of the dangerous installation. Asshown in FIG. 6 is the Flowchart of the real time Local Area ControlInstruction Executing Program.

4.3 Central Area Monitoring Center Data Processing & Control InstructionUnit

To receive all the shaking data from the “NT&SD Transducers” that isconnected to all the Local Area. After that, it decodes the transferredshaking data and displays the earthquake magnitudes and the earthquakewaveform of each Local Area, at the same time. It also judges if 70% ofall the “NT&SD Transducers” that detected the average earthquakemagnitude is greater than 4. If it does greater than 4 (Mav>4), itexecutes shut off program. The Central Area Monitoring Center computerwill send the Control Instruction to shut off the master safety switchof the dangerous installation in those earthquake Local Areas. As shownin FIG. 7 is the Flowchart of the real time Central Monitoring CenterData Processing & Control Instruction Program

Embodiment

The present system of “NT&SD Transducer” is simulated by some examples,however, the concepts and claims of the present invention are notlimited thereto.

The “NT & SD Transducer” (owned 8 vibration sensors) is applied in twofields: (1) the danger eliminated monitoring system in a distributedarea ; (2) the danger eliminated monitoring system in a building. Thedetail system description and simulation test results are listed in thefollowing:

1 The Danger Eliminated Monitoring System in a Distributed Area

1.1 System Description

The first application is focused on the disaster forbidden plans of thepower and gas supply plant in each local area. The application exampleof the danger eliminated monitoring system in a distributed area isshown in FIG. 8. It is well known that generally, there are “powersupply plant” and “natural gas supply plant” in each local area (ex,Area or town power supply plant, natural gas supply plant). These supplyplants are in charge of the resource of the “power and natural gas” inthis area. In FIG. 8, there are three distributed Local Area MonitoringCenters and one Central Area Monitoring Center. Each local area ownssufficient “NT&SD Transducers”, those are distributed in this areaequally. In order to forbid the natural damage occurrence, themonitoring center of each area owns its UPS system while power is shutoff. The distance between any two Local Area Monitoring Centers is about350 km. The Central Area Monitoring Center is located in the center ofthree Local Areas. The distance between Central Area Monitoring Centerand each Local Area Monitoring Center is about 200 km. The shaking datadetected by all of the “NT&SD Transducers” in each area will becollected by each Local Area Monitoring Center computer. The datacollected in each local area will be transferred to the CentralMonitoring Center computer.

1.2 Simulation

According to this invention, four Pentium-IV computers are used tosimulate the three Local Area Monitoring Centers and one Central AreaMonitoring Center. The four computers were located at four differentplaces; the distance among these computers are the same described inSec.1.1 (System Description) . There are 10 “NT&SD Transducers”connected to each Local Area Monitoring Center Computer throughnetwork-wire. The average distance between these ten “NT&SD Transducers”and Local Area monitoring Center is 70 km. The Local Area MonitoringCenters of the three computers are connected to the Central AreaMonitoring Center computer through the network wire. The “Local AreaData Processing Program” & the “Local Area Control Instruction ExecutingProgram” are installed in each Local Area Monitoring Center computer.The flowcharts are in FIG. 5 & FIG. 6, respectively. The “CentralMonitoring Center Data Processing & Control Instruction Program” areinstalled in the Central Area Monitoring Center computer. The flowchartis in FIG. 7. In Area 2, a simulation is hold to set up an ElectricRelay Device to shut off the master Safety Switch of power. The deviceis shown in FIG. 4.

An earthquake occurrence simulation is hold in Local area 3 (after thevibration of these 10 “NT&SD Transducers”), the distance from theSeismic Center to the Center of Local area 3 is about 70 km, the averagesimulated earthquake magnitude M3=5.2 (reported by computer). Theseismic waves move to the four directions at the speed of 7 km/sec. Theseismic waves will reach the Center of Local Area 3 within 10 seconds(by calculated 70/7=10 second). Due to the farther distance from thecenter of Local area 2 and Local area 1, the seismic waves will reach toLocal area 2 and Local area 1 after 1 minute (The distance between theseismic center and Local 1 & Local 2 are about 420 km). The earthquakemagnitude of Local Area 2 and 1 will be decreased to about M2=4.2 andM1=4.4. At this time, the earthquake waveform data collected in eachLocal Area Monitoring Center will be transferred to the Central AreaMonitoring Center at the speed of 400 times more than seismic waves. Thecollected data were judged and analyzed by the Central Area MonitoringCenter computer. The computer records were stored. The controlinstructions were delivered to the Local area 1, 2, 3 within 0.168seconds (reported by computer). Based on the earthquake magnitude ateach area, the Central Area Monitoring Center will adapt differentalternatives. These will reach the objective of the distributioncontrol. The “master safety switch of the power plant” and the “mastersafety switch of the natural gas plant” were shut off under theinstructions right before the seismic waves arrived. At the mean time,the Central Area Monitoring Center sends out the required controlinstructions. These instructions will execute the required methods inthe area where the dangerous earthquake occurred (for example,temporally shut off the operation of the nuclear power plant andtemporally cease the high-speed train). It will forbid the seconddisaster of the earthquake occurrence before the seismic waves arrive.

2. The Danger Eliminated Monitoring System in Building

2.1 System Description

The second application is focused in the building dangerous eliminatedmonitoring system. It is well known that generally, each building has amaster safety switch of power and a master safety switch of natural gas,suppose there is a ten-floor building, the master safety switch of the“natural gas” and the “power” is installed in the basement of thebuilding. The Central Control Center is located in the basement. TheCentral Control Center has two functions: the first one is to receive,judge and analyze the earthquake waveform transferred by the “NT&SDTransducers” of the whole building, the second one is the appropriatearrangements should be made while necessary; if the transferred dataappeared that the earthquake is dangerous, the “power” and “natural gas”those dangerous installation may create secondary disaster will be shutoff. The “NT&SD Transducers” are installed into the walls of the foursides of the building. Each “NT&SD Transducer” is connected to theCentral Control Center through the network wire. Remark 3: The reasonwhy the “NT&SD Transducer” is not installed in the floor or in theceiling is to forbid collecting the ineffective data. Such as thevibration of the walking and doing exercise.

2.2 Simulation

A diorama of ten-floor building is built as a simulation environment.One Pentium-IV Computer is used to simulate the Central Control Centerin the basement of the building. An electric relay device (shown in FIG.4) is set up to connect with the computer to implement the simulation onthe process of shutting off the master switch of power. There are four“NT&SD Transducers” installed into the wall in each floor, the totalamount are 40 “NT&SD Transducers“. The appropriate program presented inSection 4 (The Real time Algorithm of the Distributed Area ControlSystem) in the Central Control Center Computer is also set up. In thebuilding, the shaking data detected by each “NT&SD Transducers” will betransferred to the Central Control Center via network. While thecomputer of the Central Control Center is on, the self-test of theconnection function between the computer and all the “NT&SD Transducer”will be implemented first. The objective of the self test is to assurethe amount of the “NT&SD Transducers” those functions are normallyworking via the network. Thru the set up listed above, the data will becollected correctly. The control instruction will be send while 70% ofthe total “NT&SD Transducer” transferred to the control center computerexceeds the average vibration magnitude M>4. Before the simulation, thecomputer displays two of the “NT&SD Transducers” are not normal in thebuilding and 38 of the “NT&SD Transducers” are normal. In thisapplication example, two test cases are made. The first case is tovibrate 10 “NT&SD Transducers”. The average magnitude of earthquakedetected by each “NT&SD Transducer” is M=5.2 (reported by computer). TheCentral Control Center Computer doesn't take any action on it (becausethe 10/38<70%). The second case, the simulation to vibrate the wholebuilding has been done. It results the simulation of earthquake averagemagnitude M=6.2 (reported by computer). The control instruction sentfrom the Central Control Center shuts off the “master safety switch ofpower’ immediately. Remark 4: The reason why the level of 70% of thetotal “NT&SD Transducer” is set is to keep from the creation ofincorrect and ineffective data. It can't be concluded the occurrence ofearthquake by the limited (such as, 20%) “NT&SD Transducer” transferreddata within few floors. The incorrect 20% of the total “NT&SDTransducers” transferred the shaking data could be resulted from thedecoration of the floors. The “NT&SD Transducers” in each floor willreceive real vibration signals while the real earthquake occurs. TABLE 1Within 1000 vibration experiments, the relation between the simulatedactual earthquake magnitudes and the average value of the total ON-OFFtimes detected by the micro-chip inside the “NT&SD Transducer” (owned 1vibration sensors) every 5 seconds. Earthquake ON-OFF values o

Vibration Senso

Magnitudes 5 10 15 20 25 30 35 40 45 50 1 10 21 29 41 51 59 68 78 92 992 14 27 41 54 67 81 94 108 121 135 3 18 35 52 69 89 105 123 142 161 1804 25 49 74 99 124 152 174 199 224 248 5 28 59 83 112 138 168 180 216 252279 6 31 63 92 119 148 179 209 238 270 298 7 36 71 109 144 178 216 251286 321 355

TABLE 2 Within 1000 vibration experiments, the relation between thesimulated actual earthquake magnitudes and the average value of thetotal ON-OFF times detected by the micro-chip inside the “NT&SDTransducer” (owned 8 vibration sensors) every 5 seconds. EarthquakeON-OFF values o

Vibration Senso

Magnitudes 5 10 15 20 25 30 35 40 45 50 1 72 143 210 279 349 419 502 563640 718 2 120 238 357 479 602 718 838 954 1073 1212 3 136 275 405 541678 750 934 1080 1221 1351 4 198 402 598 803 998 1215 1395 1614 17951992 5 224 442 669 898 1121 1341 1543 1785 2034 2241 6 243 482 725 9721213 1432 1673 1883 2133 2324 7 279 558 839 1011 1368 1652 1902 22012453 2765Designation of Main Components

-   1 Detection Device-   2 Central monitor computer-   3 Control device-   11 Vibration Sensors-   12 Noise filter-   13 Micro processors-   21 Interface card-   31 7-magnitude display device-   32 Circuit-breaker

1. An earthquake detection control system, comprising: a plurality of well-distributed detection devices 1 having a plurality of vibration sensors 11 which are used to sense the occurrence of earthquake and transform the occurrence into electric digitals as shaking data; a plurality of well-distributed micro processors 13, which are capable of receiving and calculating the shaking data; and a plurality of well-distributed local area computers, which are capable of receiving the shaking data from said micro processors 13; the function of local control computers is not only to transfer shaking data from micro processors 13 to central monitor computer 2 but also to receive remote control orders and to take into actions; and a central monitor computer 2 of Central Area Monitoring Center, which is capable of integrating, calculating, judging said shaking data after received, transferring the output of magnitude of the earthquake, and remotely controlling local area computers; wherein, the vibration sensor 11 has the characteristics that while the vibrating sensor 11 stands stationary, the resistance of the vibration sensor 11 is infinite, then it is at the OFF status; while the “NT&SD Transducer” is suffered by the external power, it reaches at the status of centrifugal force, the plane surface slants, the characteristic of the resistance of the vibration sensor 11 has been changed to 0, then it is at the “ON” status; While the external power disappears, the vibration sensor 11 turns back to the ‘OFF’ status.
 2. The earthquake detection control system according to claim 1, wherein the well-distributed micro processors 13 is suitable for Micro-Chip 89C51 and the like, and is used to calculate shaking data, judge the data of magnitude of earthquake; then, said data is transferred to PC8255 interface card 21 and the like through some parallel bus.
 3. The earthquake detection control system according to claim 2, wherein the data processed by micro processors 13 is transferred to the central monitor computer 2 of Central Area Monitoring Center by use of the program of the central monitor computer 2, which follows TCP/IP communication protocols.
 4. A method for preventing the second disaster of earthquake, comprising: applying the earthquake detection control system of claim 1 to receive the shaking data by use of a central monitor computer 2 of Central Area Monitoring Center, and then to calculate the data and to judge that, finally to send a output signal of magnitude of the earthquake; subsequently performing a predetermined action according to the signals produced by control device 3 from said output signal.
 5. The method for preventing the second disaster of earthquake according to claim 4, wherein the predetermined action can be a secure On/Off action which is performed by applying each local area control computers directly, or a central monitor computer 2 indirectly.
 6. The method for preventing the second disaster of earthquake according to claim 4, wherein the predetermined action comprises automatically to shut off the master natural gas switch and the master safety switch of power.
 7. The method for preventing the second disaster of earthquake according to claim 4, wherein the central monitor computer 2 of Central Area Monitoring Center comprises a central computer and a plurality of local area computers.
 8. The method for preventing the second disaster of earthquake according to claim 7, wherein the central computer and a plurality of local area computers transfer data by following TCP/IP communication protocols.
 9. The method for preventing the second disaster of earthquake according to claim 4, wherein the predetermined action is performed by use of an electric relay device of UPS power supply. 